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Linux/tools/perf/builtin-diff.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * builtin-diff.c
  4  *
  5  * Builtin diff command: Analyze two perf.data input files, look up and read
  6  * DSOs and symbol information, sort them and produce a diff.
  7  */
  8 #include "builtin.h"
  9 #include "perf.h"
 10 
 11 #include "util/debug.h"
 12 #include "util/event.h"
 13 #include "util/hist.h"
 14 #include "util/evsel.h"
 15 #include "util/evlist.h"
 16 #include "util/session.h"
 17 #include "util/tool.h"
 18 #include "util/sort.h"
 19 #include "util/srcline.h"
 20 #include "util/symbol.h"
 21 #include "util/data.h"
 22 #include "util/config.h"
 23 #include "util/time-utils.h"
 24 #include "util/annotate.h"
 25 #include "util/map.h"
 26 #include "util/spark.h"
 27 #include "util/block-info.h"
 28 #include <linux/err.h>
 29 #include <linux/zalloc.h>
 30 #include <subcmd/pager.h>
 31 #include <subcmd/parse-options.h>
 32 
 33 #include <errno.h>
 34 #include <inttypes.h>
 35 #include <stdlib.h>
 36 #include <math.h>
 37 
 38 struct perf_diff {
 39         struct perf_tool                 tool;
 40         const char                      *time_str;
 41         struct perf_time_interval       *ptime_range;
 42         int                              range_size;
 43         int                              range_num;
 44         bool                             has_br_stack;
 45 };
 46 
 47 /* Diff command specific HPP columns. */
 48 enum {
 49         PERF_HPP_DIFF__BASELINE,
 50         PERF_HPP_DIFF__PERIOD,
 51         PERF_HPP_DIFF__PERIOD_BASELINE,
 52         PERF_HPP_DIFF__DELTA,
 53         PERF_HPP_DIFF__RATIO,
 54         PERF_HPP_DIFF__WEIGHTED_DIFF,
 55         PERF_HPP_DIFF__FORMULA,
 56         PERF_HPP_DIFF__DELTA_ABS,
 57         PERF_HPP_DIFF__CYCLES,
 58         PERF_HPP_DIFF__CYCLES_HIST,
 59 
 60         PERF_HPP_DIFF__MAX_INDEX
 61 };
 62 
 63 struct diff_hpp_fmt {
 64         struct perf_hpp_fmt      fmt;
 65         int                      idx;
 66         char                    *header;
 67         int                      header_width;
 68 };
 69 
 70 struct data__file {
 71         struct perf_session     *session;
 72         struct perf_data         data;
 73         int                      idx;
 74         struct hists            *hists;
 75         struct diff_hpp_fmt      fmt[PERF_HPP_DIFF__MAX_INDEX];
 76 };
 77 
 78 static struct data__file *data__files;
 79 static int data__files_cnt;
 80 
 81 #define data__for_each_file_start(i, d, s)      \
 82         for (i = s, d = &data__files[s];        \
 83              i < data__files_cnt;               \
 84              i++, d = &data__files[i])
 85 
 86 #define data__for_each_file(i, d) data__for_each_file_start(i, d, 0)
 87 #define data__for_each_file_new(i, d) data__for_each_file_start(i, d, 1)
 88 
 89 static bool force;
 90 static bool show_period;
 91 static bool show_formula;
 92 static bool show_baseline_only;
 93 static bool cycles_hist;
 94 static unsigned int sort_compute = 1;
 95 
 96 static s64 compute_wdiff_w1;
 97 static s64 compute_wdiff_w2;
 98 
 99 static const char               *cpu_list;
100 static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
101 
102 enum {
103         COMPUTE_DELTA,
104         COMPUTE_RATIO,
105         COMPUTE_WEIGHTED_DIFF,
106         COMPUTE_DELTA_ABS,
107         COMPUTE_CYCLES,
108         COMPUTE_MAX,
109 };
110 
111 const char *compute_names[COMPUTE_MAX] = {
112         [COMPUTE_DELTA] = "delta",
113         [COMPUTE_DELTA_ABS] = "delta-abs",
114         [COMPUTE_RATIO] = "ratio",
115         [COMPUTE_WEIGHTED_DIFF] = "wdiff",
116         [COMPUTE_CYCLES] = "cycles",
117 };
118 
119 static int compute = COMPUTE_DELTA_ABS;
120 
121 static int compute_2_hpp[COMPUTE_MAX] = {
122         [COMPUTE_DELTA]         = PERF_HPP_DIFF__DELTA,
123         [COMPUTE_DELTA_ABS]     = PERF_HPP_DIFF__DELTA_ABS,
124         [COMPUTE_RATIO]         = PERF_HPP_DIFF__RATIO,
125         [COMPUTE_WEIGHTED_DIFF] = PERF_HPP_DIFF__WEIGHTED_DIFF,
126         [COMPUTE_CYCLES]        = PERF_HPP_DIFF__CYCLES,
127 };
128 
129 #define MAX_COL_WIDTH 70
130 
131 static struct header_column {
132         const char *name;
133         int width;
134 } columns[PERF_HPP_DIFF__MAX_INDEX] = {
135         [PERF_HPP_DIFF__BASELINE] = {
136                 .name  = "Baseline",
137         },
138         [PERF_HPP_DIFF__PERIOD] = {
139                 .name  = "Period",
140                 .width = 14,
141         },
142         [PERF_HPP_DIFF__PERIOD_BASELINE] = {
143                 .name  = "Base period",
144                 .width = 14,
145         },
146         [PERF_HPP_DIFF__DELTA] = {
147                 .name  = "Delta",
148                 .width = 7,
149         },
150         [PERF_HPP_DIFF__DELTA_ABS] = {
151                 .name  = "Delta Abs",
152                 .width = 7,
153         },
154         [PERF_HPP_DIFF__RATIO] = {
155                 .name  = "Ratio",
156                 .width = 14,
157         },
158         [PERF_HPP_DIFF__WEIGHTED_DIFF] = {
159                 .name  = "Weighted diff",
160                 .width = 14,
161         },
162         [PERF_HPP_DIFF__FORMULA] = {
163                 .name  = "Formula",
164                 .width = MAX_COL_WIDTH,
165         },
166         [PERF_HPP_DIFF__CYCLES] = {
167                 .name  = "[Program Block Range] Cycles Diff",
168                 .width = 70,
169         },
170         [PERF_HPP_DIFF__CYCLES_HIST] = {
171                 .name  = "stddev/Hist",
172                 .width = NUM_SPARKS + 9,
173         }
174 };
175 
176 static int setup_compute_opt_wdiff(char *opt)
177 {
178         char *w1_str = opt;
179         char *w2_str;
180 
181         int ret = -EINVAL;
182 
183         if (!opt)
184                 goto out;
185 
186         w2_str = strchr(opt, ',');
187         if (!w2_str)
188                 goto out;
189 
190         *w2_str++ = 0x0;
191         if (!*w2_str)
192                 goto out;
193 
194         compute_wdiff_w1 = strtol(w1_str, NULL, 10);
195         compute_wdiff_w2 = strtol(w2_str, NULL, 10);
196 
197         if (!compute_wdiff_w1 || !compute_wdiff_w2)
198                 goto out;
199 
200         pr_debug("compute wdiff w1(%" PRId64 ") w2(%" PRId64 ")\n",
201                   compute_wdiff_w1, compute_wdiff_w2);
202 
203         ret = 0;
204 
205  out:
206         if (ret)
207                 pr_err("Failed: wrong weight data, use 'wdiff:w1,w2'\n");
208 
209         return ret;
210 }
211 
212 static int setup_compute_opt(char *opt)
213 {
214         if (compute == COMPUTE_WEIGHTED_DIFF)
215                 return setup_compute_opt_wdiff(opt);
216 
217         if (opt) {
218                 pr_err("Failed: extra option specified '%s'", opt);
219                 return -EINVAL;
220         }
221 
222         return 0;
223 }
224 
225 static int setup_compute(const struct option *opt, const char *str,
226                          int unset __maybe_unused)
227 {
228         int *cp = (int *) opt->value;
229         char *cstr = (char *) str;
230         char buf[50];
231         unsigned i;
232         char *option;
233 
234         if (!str) {
235                 *cp = COMPUTE_DELTA;
236                 return 0;
237         }
238 
239         option = strchr(str, ':');
240         if (option) {
241                 unsigned len = option++ - str;
242 
243                 /*
244                  * The str data are not writeable, so we need
245                  * to use another buffer.
246                  */
247 
248                 /* No option value is longer. */
249                 if (len >= sizeof(buf))
250                         return -EINVAL;
251 
252                 strncpy(buf, str, len);
253                 buf[len] = 0x0;
254                 cstr = buf;
255         }
256 
257         for (i = 0; i < COMPUTE_MAX; i++)
258                 if (!strcmp(cstr, compute_names[i])) {
259                         *cp = i;
260                         return setup_compute_opt(option);
261                 }
262 
263         pr_err("Failed: '%s' is not computation method "
264                "(use 'delta','ratio' or 'wdiff')\n", str);
265         return -EINVAL;
266 }
267 
268 static double period_percent(struct hist_entry *he, u64 period)
269 {
270         u64 total = hists__total_period(he->hists);
271 
272         return (period * 100.0) / total;
273 }
274 
275 static double compute_delta(struct hist_entry *he, struct hist_entry *pair)
276 {
277         double old_percent = period_percent(he, he->stat.period);
278         double new_percent = period_percent(pair, pair->stat.period);
279 
280         pair->diff.period_ratio_delta = new_percent - old_percent;
281         pair->diff.computed = true;
282         return pair->diff.period_ratio_delta;
283 }
284 
285 static double compute_ratio(struct hist_entry *he, struct hist_entry *pair)
286 {
287         double old_period = he->stat.period ?: 1;
288         double new_period = pair->stat.period;
289 
290         pair->diff.computed = true;
291         pair->diff.period_ratio = new_period / old_period;
292         return pair->diff.period_ratio;
293 }
294 
295 static s64 compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
296 {
297         u64 old_period = he->stat.period;
298         u64 new_period = pair->stat.period;
299 
300         pair->diff.computed = true;
301         pair->diff.wdiff = new_period * compute_wdiff_w2 -
302                            old_period * compute_wdiff_w1;
303 
304         return pair->diff.wdiff;
305 }
306 
307 static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
308                          char *buf, size_t size)
309 {
310         u64 he_total = he->hists->stats.total_period;
311         u64 pair_total = pair->hists->stats.total_period;
312 
313         if (symbol_conf.filter_relative) {
314                 he_total = he->hists->stats.total_non_filtered_period;
315                 pair_total = pair->hists->stats.total_non_filtered_period;
316         }
317         return scnprintf(buf, size,
318                          "(%" PRIu64 " * 100 / %" PRIu64 ") - "
319                          "(%" PRIu64 " * 100 / %" PRIu64 ")",
320                          pair->stat.period, pair_total,
321                          he->stat.period, he_total);
322 }
323 
324 static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
325                          char *buf, size_t size)
326 {
327         double old_period = he->stat.period;
328         double new_period = pair->stat.period;
329 
330         return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
331 }
332 
333 static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair,
334                          char *buf, size_t size)
335 {
336         u64 old_period = he->stat.period;
337         u64 new_period = pair->stat.period;
338 
339         return scnprintf(buf, size,
340                   "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
341                   new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);
342 }
343 
344 static int formula_fprintf(struct hist_entry *he, struct hist_entry *pair,
345                            char *buf, size_t size)
346 {
347         switch (compute) {
348         case COMPUTE_DELTA:
349         case COMPUTE_DELTA_ABS:
350                 return formula_delta(he, pair, buf, size);
351         case COMPUTE_RATIO:
352                 return formula_ratio(he, pair, buf, size);
353         case COMPUTE_WEIGHTED_DIFF:
354                 return formula_wdiff(he, pair, buf, size);
355         default:
356                 BUG_ON(1);
357         }
358 
359         return -1;
360 }
361 
362 static void *block_hist_zalloc(size_t size)
363 {
364         struct block_hist *bh;
365 
366         bh = zalloc(size + sizeof(*bh));
367         if (!bh)
368                 return NULL;
369 
370         return &bh->he;
371 }
372 
373 static void block_hist_free(void *he)
374 {
375         struct block_hist *bh;
376 
377         bh = container_of(he, struct block_hist, he);
378         hists__delete_entries(&bh->block_hists);
379         free(bh);
380 }
381 
382 struct hist_entry_ops block_hist_ops = {
383         .new    = block_hist_zalloc,
384         .free   = block_hist_free,
385 };
386 
387 static int diff__process_sample_event(struct perf_tool *tool,
388                                       union perf_event *event,
389                                       struct perf_sample *sample,
390                                       struct evsel *evsel,
391                                       struct machine *machine)
392 {
393         struct perf_diff *pdiff = container_of(tool, struct perf_diff, tool);
394         struct addr_location al;
395         struct hists *hists = evsel__hists(evsel);
396         int ret = -1;
397 
398         if (perf_time__ranges_skip_sample(pdiff->ptime_range, pdiff->range_num,
399                                           sample->time)) {
400                 return 0;
401         }
402 
403         if (machine__resolve(machine, &al, sample) < 0) {
404                 pr_warning("problem processing %d event, skipping it.\n",
405                            event->header.type);
406                 return -1;
407         }
408 
409         if (cpu_list && !test_bit(sample->cpu, cpu_bitmap)) {
410                 ret = 0;
411                 goto out_put;
412         }
413 
414         if (compute != COMPUTE_CYCLES) {
415                 if (!hists__add_entry(hists, &al, NULL, NULL, NULL, sample,
416                                       true)) {
417                         pr_warning("problem incrementing symbol period, "
418                                    "skipping event\n");
419                         goto out_put;
420                 }
421         } else {
422                 if (!hists__add_entry_ops(hists, &block_hist_ops, &al, NULL,
423                                           NULL, NULL, sample, true)) {
424                         pr_warning("problem incrementing symbol period, "
425                                    "skipping event\n");
426                         goto out_put;
427                 }
428 
429                 hist__account_cycles(sample->branch_stack, &al, sample, false,
430                                      NULL);
431         }
432 
433         /*
434          * The total_period is updated here before going to the output
435          * tree since normally only the baseline hists will call
436          * hists__output_resort() and precompute needs the total
437          * period in order to sort entries by percentage delta.
438          */
439         hists->stats.total_period += sample->period;
440         if (!al.filtered)
441                 hists->stats.total_non_filtered_period += sample->period;
442         ret = 0;
443 out_put:
444         addr_location__put(&al);
445         return ret;
446 }
447 
448 static struct perf_diff pdiff = {
449         .tool = {
450                 .sample = diff__process_sample_event,
451                 .mmap   = perf_event__process_mmap,
452                 .mmap2  = perf_event__process_mmap2,
453                 .comm   = perf_event__process_comm,
454                 .exit   = perf_event__process_exit,
455                 .fork   = perf_event__process_fork,
456                 .lost   = perf_event__process_lost,
457                 .namespaces = perf_event__process_namespaces,
458                 .ordered_events = true,
459                 .ordering_requires_timestamps = true,
460         },
461 };
462 
463 static struct evsel *evsel_match(struct evsel *evsel,
464                                       struct evlist *evlist)
465 {
466         struct evsel *e;
467 
468         evlist__for_each_entry(evlist, e) {
469                 if (perf_evsel__match2(evsel, e))
470                         return e;
471         }
472 
473         return NULL;
474 }
475 
476 static void perf_evlist__collapse_resort(struct evlist *evlist)
477 {
478         struct evsel *evsel;
479 
480         evlist__for_each_entry(evlist, evsel) {
481                 struct hists *hists = evsel__hists(evsel);
482 
483                 hists__collapse_resort(hists, NULL);
484         }
485 }
486 
487 static struct data__file *fmt_to_data_file(struct perf_hpp_fmt *fmt)
488 {
489         struct diff_hpp_fmt *dfmt = container_of(fmt, struct diff_hpp_fmt, fmt);
490         void *ptr = dfmt - dfmt->idx;
491         struct data__file *d = container_of(ptr, struct data__file, fmt);
492 
493         return d;
494 }
495 
496 static struct hist_entry*
497 get_pair_data(struct hist_entry *he, struct data__file *d)
498 {
499         if (hist_entry__has_pairs(he)) {
500                 struct hist_entry *pair;
501 
502                 list_for_each_entry(pair, &he->pairs.head, pairs.node)
503                         if (pair->hists == d->hists)
504                                 return pair;
505         }
506 
507         return NULL;
508 }
509 
510 static struct hist_entry*
511 get_pair_fmt(struct hist_entry *he, struct diff_hpp_fmt *dfmt)
512 {
513         struct data__file *d = fmt_to_data_file(&dfmt->fmt);
514 
515         return get_pair_data(he, d);
516 }
517 
518 static void hists__baseline_only(struct hists *hists)
519 {
520         struct rb_root_cached *root;
521         struct rb_node *next;
522 
523         if (hists__has(hists, need_collapse))
524                 root = &hists->entries_collapsed;
525         else
526                 root = hists->entries_in;
527 
528         next = rb_first_cached(root);
529         while (next != NULL) {
530                 struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
531 
532                 next = rb_next(&he->rb_node_in);
533                 if (!hist_entry__next_pair(he)) {
534                         rb_erase_cached(&he->rb_node_in, root);
535                         hist_entry__delete(he);
536                 }
537         }
538 }
539 
540 static int64_t block_cycles_diff_cmp(struct hist_entry *left,
541                                      struct hist_entry *right)
542 {
543         bool pairs_left  = hist_entry__has_pairs(left);
544         bool pairs_right = hist_entry__has_pairs(right);
545         s64 l, r;
546 
547         if (!pairs_left && !pairs_right)
548                 return 0;
549 
550         l = llabs(left->diff.cycles);
551         r = llabs(right->diff.cycles);
552         return r - l;
553 }
554 
555 static int64_t block_sort(struct perf_hpp_fmt *fmt __maybe_unused,
556                           struct hist_entry *left, struct hist_entry *right)
557 {
558         return block_cycles_diff_cmp(right, left);
559 }
560 
561 static void init_block_hist(struct block_hist *bh)
562 {
563         __hists__init(&bh->block_hists, &bh->block_list);
564         perf_hpp_list__init(&bh->block_list);
565 
566         INIT_LIST_HEAD(&bh->block_fmt.list);
567         INIT_LIST_HEAD(&bh->block_fmt.sort_list);
568         bh->block_fmt.cmp = block_info__cmp;
569         bh->block_fmt.sort = block_sort;
570         perf_hpp_list__register_sort_field(&bh->block_list,
571                                            &bh->block_fmt);
572         bh->valid = true;
573 }
574 
575 static int block_pair_cmp(struct hist_entry *a, struct hist_entry *b)
576 {
577         struct block_info *bi_a = a->block_info;
578         struct block_info *bi_b = b->block_info;
579         int cmp;
580 
581         if (!bi_a->sym || !bi_b->sym)
582                 return -1;
583 
584         cmp = strcmp(bi_a->sym->name, bi_b->sym->name);
585 
586         if ((!cmp) && (bi_a->start == bi_b->start) && (bi_a->end == bi_b->end))
587                 return 0;
588 
589         return -1;
590 }
591 
592 static struct hist_entry *get_block_pair(struct hist_entry *he,
593                                          struct hists *hists_pair)
594 {
595         struct rb_root_cached *root = hists_pair->entries_in;
596         struct rb_node *next = rb_first_cached(root);
597         int cmp;
598 
599         while (next != NULL) {
600                 struct hist_entry *he_pair = rb_entry(next, struct hist_entry,
601                                                       rb_node_in);
602 
603                 next = rb_next(&he_pair->rb_node_in);
604 
605                 cmp = block_pair_cmp(he_pair, he);
606                 if (!cmp)
607                         return he_pair;
608         }
609 
610         return NULL;
611 }
612 
613 static void init_spark_values(unsigned long *svals, int num)
614 {
615         for (int i = 0; i < num; i++)
616                 svals[i] = 0;
617 }
618 
619 static void update_spark_value(unsigned long *svals, int num,
620                                struct stats *stats, u64 val)
621 {
622         int n = stats->n;
623 
624         if (n < num)
625                 svals[n] = val;
626 }
627 
628 static void compute_cycles_diff(struct hist_entry *he,
629                                 struct hist_entry *pair)
630 {
631         pair->diff.computed = true;
632         if (pair->block_info->num && he->block_info->num) {
633                 pair->diff.cycles =
634                         pair->block_info->cycles_aggr / pair->block_info->num_aggr -
635                         he->block_info->cycles_aggr / he->block_info->num_aggr;
636 
637                 if (!cycles_hist)
638                         return;
639 
640                 init_stats(&pair->diff.stats);
641                 init_spark_values(pair->diff.svals, NUM_SPARKS);
642 
643                 for (int i = 0; i < pair->block_info->num; i++) {
644                         u64 val;
645 
646                         if (i >= he->block_info->num || i >= NUM_SPARKS)
647                                 break;
648 
649                         val = llabs(pair->block_info->cycles_spark[i] -
650                                      he->block_info->cycles_spark[i]);
651 
652                         update_spark_value(pair->diff.svals, NUM_SPARKS,
653                                            &pair->diff.stats, val);
654                         update_stats(&pair->diff.stats, val);
655                 }
656         }
657 }
658 
659 static void block_hists_match(struct hists *hists_base,
660                               struct hists *hists_pair)
661 {
662         struct rb_root_cached *root = hists_base->entries_in;
663         struct rb_node *next = rb_first_cached(root);
664 
665         while (next != NULL) {
666                 struct hist_entry *he = rb_entry(next, struct hist_entry,
667                                                  rb_node_in);
668                 struct hist_entry *pair = get_block_pair(he, hists_pair);
669 
670                 next = rb_next(&he->rb_node_in);
671 
672                 if (pair) {
673                         hist_entry__add_pair(pair, he);
674                         compute_cycles_diff(he, pair);
675                 }
676         }
677 }
678 
679 static void hists__precompute(struct hists *hists)
680 {
681         struct rb_root_cached *root;
682         struct rb_node *next;
683 
684         if (hists__has(hists, need_collapse))
685                 root = &hists->entries_collapsed;
686         else
687                 root = hists->entries_in;
688 
689         next = rb_first_cached(root);
690         while (next != NULL) {
691                 struct block_hist *bh, *pair_bh;
692                 struct hist_entry *he, *pair;
693                 struct data__file *d;
694                 int i;
695 
696                 he   = rb_entry(next, struct hist_entry, rb_node_in);
697                 next = rb_next(&he->rb_node_in);
698 
699                 if (compute == COMPUTE_CYCLES) {
700                         bh = container_of(he, struct block_hist, he);
701                         init_block_hist(bh);
702                         block_info__process_sym(he, bh, NULL, 0);
703                 }
704 
705                 data__for_each_file_new(i, d) {
706                         pair = get_pair_data(he, d);
707                         if (!pair)
708                                 continue;
709 
710                         switch (compute) {
711                         case COMPUTE_DELTA:
712                         case COMPUTE_DELTA_ABS:
713                                 compute_delta(he, pair);
714                                 break;
715                         case COMPUTE_RATIO:
716                                 compute_ratio(he, pair);
717                                 break;
718                         case COMPUTE_WEIGHTED_DIFF:
719                                 compute_wdiff(he, pair);
720                                 break;
721                         case COMPUTE_CYCLES:
722                                 pair_bh = container_of(pair, struct block_hist,
723                                                        he);
724                                 init_block_hist(pair_bh);
725                                 block_info__process_sym(pair, pair_bh, NULL, 0);
726 
727                                 bh = container_of(he, struct block_hist, he);
728 
729                                 if (bh->valid && pair_bh->valid) {
730                                         block_hists_match(&bh->block_hists,
731                                                           &pair_bh->block_hists);
732                                         hists__output_resort(&pair_bh->block_hists,
733                                                              NULL);
734                                 }
735                                 break;
736                         default:
737                                 BUG_ON(1);
738                         }
739                 }
740         }
741 }
742 
743 static int64_t cmp_doubles(double l, double r)
744 {
745         if (l > r)
746                 return -1;
747         else if (l < r)
748                 return 1;
749         else
750                 return 0;
751 }
752 
753 static int64_t
754 __hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
755                         int c)
756 {
757         switch (c) {
758         case COMPUTE_DELTA:
759         {
760                 double l = left->diff.period_ratio_delta;
761                 double r = right->diff.period_ratio_delta;
762 
763                 return cmp_doubles(l, r);
764         }
765         case COMPUTE_DELTA_ABS:
766         {
767                 double l = fabs(left->diff.period_ratio_delta);
768                 double r = fabs(right->diff.period_ratio_delta);
769 
770                 return cmp_doubles(l, r);
771         }
772         case COMPUTE_RATIO:
773         {
774                 double l = left->diff.period_ratio;
775                 double r = right->diff.period_ratio;
776 
777                 return cmp_doubles(l, r);
778         }
779         case COMPUTE_WEIGHTED_DIFF:
780         {
781                 s64 l = left->diff.wdiff;
782                 s64 r = right->diff.wdiff;
783 
784                 return r - l;
785         }
786         default:
787                 BUG_ON(1);
788         }
789 
790         return 0;
791 }
792 
793 static int64_t
794 hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
795                         int c, int sort_idx)
796 {
797         bool pairs_left  = hist_entry__has_pairs(left);
798         bool pairs_right = hist_entry__has_pairs(right);
799         struct hist_entry *p_right, *p_left;
800 
801         if (!pairs_left && !pairs_right)
802                 return 0;
803 
804         if (!pairs_left || !pairs_right)
805                 return pairs_left ? -1 : 1;
806 
807         p_left  = get_pair_data(left,  &data__files[sort_idx]);
808         p_right = get_pair_data(right, &data__files[sort_idx]);
809 
810         if (!p_left && !p_right)
811                 return 0;
812 
813         if (!p_left || !p_right)
814                 return p_left ? -1 : 1;
815 
816         /*
817          * We have 2 entries of same kind, let's
818          * make the data comparison.
819          */
820         return __hist_entry__cmp_compute(p_left, p_right, c);
821 }
822 
823 static int64_t
824 hist_entry__cmp_compute_idx(struct hist_entry *left, struct hist_entry *right,
825                             int c, int sort_idx)
826 {
827         struct hist_entry *p_right, *p_left;
828 
829         p_left  = get_pair_data(left,  &data__files[sort_idx]);
830         p_right = get_pair_data(right, &data__files[sort_idx]);
831 
832         if (!p_left && !p_right)
833                 return 0;
834 
835         if (!p_left || !p_right)
836                 return p_left ? -1 : 1;
837 
838         if (c != COMPUTE_DELTA && c != COMPUTE_DELTA_ABS) {
839                 /*
840                  * The delta can be computed without the baseline, but
841                  * others are not.  Put those entries which have no
842                  * values below.
843                  */
844                 if (left->dummy && right->dummy)
845                         return 0;
846 
847                 if (left->dummy || right->dummy)
848                         return left->dummy ? 1 : -1;
849         }
850 
851         return __hist_entry__cmp_compute(p_left, p_right, c);
852 }
853 
854 static int64_t
855 hist_entry__cmp_nop(struct perf_hpp_fmt *fmt __maybe_unused,
856                     struct hist_entry *left __maybe_unused,
857                     struct hist_entry *right __maybe_unused)
858 {
859         return 0;
860 }
861 
862 static int64_t
863 hist_entry__cmp_baseline(struct perf_hpp_fmt *fmt __maybe_unused,
864                          struct hist_entry *left, struct hist_entry *right)
865 {
866         if (left->stat.period == right->stat.period)
867                 return 0;
868         return left->stat.period > right->stat.period ? 1 : -1;
869 }
870 
871 static int64_t
872 hist_entry__cmp_delta(struct perf_hpp_fmt *fmt,
873                       struct hist_entry *left, struct hist_entry *right)
874 {
875         struct data__file *d = fmt_to_data_file(fmt);
876 
877         return hist_entry__cmp_compute(right, left, COMPUTE_DELTA, d->idx);
878 }
879 
880 static int64_t
881 hist_entry__cmp_delta_abs(struct perf_hpp_fmt *fmt,
882                       struct hist_entry *left, struct hist_entry *right)
883 {
884         struct data__file *d = fmt_to_data_file(fmt);
885 
886         return hist_entry__cmp_compute(right, left, COMPUTE_DELTA_ABS, d->idx);
887 }
888 
889 static int64_t
890 hist_entry__cmp_ratio(struct perf_hpp_fmt *fmt,
891                       struct hist_entry *left, struct hist_entry *right)
892 {
893         struct data__file *d = fmt_to_data_file(fmt);
894 
895         return hist_entry__cmp_compute(right, left, COMPUTE_RATIO, d->idx);
896 }
897 
898 static int64_t
899 hist_entry__cmp_wdiff(struct perf_hpp_fmt *fmt,
900                       struct hist_entry *left, struct hist_entry *right)
901 {
902         struct data__file *d = fmt_to_data_file(fmt);
903 
904         return hist_entry__cmp_compute(right, left, COMPUTE_WEIGHTED_DIFF, d->idx);
905 }
906 
907 static int64_t
908 hist_entry__cmp_delta_idx(struct perf_hpp_fmt *fmt __maybe_unused,
909                           struct hist_entry *left, struct hist_entry *right)
910 {
911         return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA,
912                                            sort_compute);
913 }
914 
915 static int64_t
916 hist_entry__cmp_delta_abs_idx(struct perf_hpp_fmt *fmt __maybe_unused,
917                               struct hist_entry *left, struct hist_entry *right)
918 {
919         return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA_ABS,
920                                            sort_compute);
921 }
922 
923 static int64_t
924 hist_entry__cmp_ratio_idx(struct perf_hpp_fmt *fmt __maybe_unused,
925                           struct hist_entry *left, struct hist_entry *right)
926 {
927         return hist_entry__cmp_compute_idx(right, left, COMPUTE_RATIO,
928                                            sort_compute);
929 }
930 
931 static int64_t
932 hist_entry__cmp_wdiff_idx(struct perf_hpp_fmt *fmt __maybe_unused,
933                           struct hist_entry *left, struct hist_entry *right)
934 {
935         return hist_entry__cmp_compute_idx(right, left, COMPUTE_WEIGHTED_DIFF,
936                                            sort_compute);
937 }
938 
939 static void hists__process(struct hists *hists)
940 {
941         if (show_baseline_only)
942                 hists__baseline_only(hists);
943 
944         hists__precompute(hists);
945         hists__output_resort(hists, NULL);
946 
947         if (compute == COMPUTE_CYCLES)
948                 symbol_conf.report_block = true;
949 
950         hists__fprintf(hists, !quiet, 0, 0, 0, stdout,
951                        !symbol_conf.use_callchain);
952 }
953 
954 static void data__fprintf(void)
955 {
956         struct data__file *d;
957         int i;
958 
959         fprintf(stdout, "# Data files:\n");
960 
961         data__for_each_file(i, d)
962                 fprintf(stdout, "#  [%d] %s %s\n",
963                         d->idx, d->data.path,
964                         !d->idx ? "(Baseline)" : "");
965 
966         fprintf(stdout, "#\n");
967 }
968 
969 static void data_process(void)
970 {
971         struct evlist *evlist_base = data__files[0].session->evlist;
972         struct evsel *evsel_base;
973         bool first = true;
974 
975         evlist__for_each_entry(evlist_base, evsel_base) {
976                 struct hists *hists_base = evsel__hists(evsel_base);
977                 struct data__file *d;
978                 int i;
979 
980                 data__for_each_file_new(i, d) {
981                         struct evlist *evlist = d->session->evlist;
982                         struct evsel *evsel;
983                         struct hists *hists;
984 
985                         evsel = evsel_match(evsel_base, evlist);
986                         if (!evsel)
987                                 continue;
988 
989                         hists = evsel__hists(evsel);
990                         d->hists = hists;
991 
992                         hists__match(hists_base, hists);
993 
994                         if (!show_baseline_only)
995                                 hists__link(hists_base, hists);
996                 }
997 
998                 if (!quiet) {
999                         fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
1000                                 perf_evsel__name(evsel_base));
1001                 }
1002 
1003                 first = false;
1004 
1005                 if (verbose > 0 || ((data__files_cnt > 2) && !quiet))
1006                         data__fprintf();
1007 
1008                 /* Don't sort callchain for perf diff */
1009                 perf_evsel__reset_sample_bit(evsel_base, CALLCHAIN);
1010 
1011                 hists__process(hists_base);
1012         }
1013 }
1014 
1015 static void data__free(struct data__file *d)
1016 {
1017         int col;
1018 
1019         for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
1020                 struct diff_hpp_fmt *fmt = &d->fmt[col];
1021 
1022                 zfree(&fmt->header);
1023         }
1024 }
1025 
1026 static int abstime_str_dup(char **pstr)
1027 {
1028         char *str = NULL;
1029 
1030         if (pdiff.time_str && strchr(pdiff.time_str, ':')) {
1031                 str = strdup(pdiff.time_str);
1032                 if (!str)
1033                         return -ENOMEM;
1034         }
1035 
1036         *pstr = str;
1037         return 0;
1038 }
1039 
1040 static int parse_absolute_time(struct data__file *d, char **pstr)
1041 {
1042         char *p = *pstr;
1043         int ret;
1044 
1045         /*
1046          * Absolute timestamp for one file has the format: a.b,c.d
1047          * For multiple files, the format is: a.b,c.d:a.b,c.d
1048          */
1049         p = strchr(*pstr, ':');
1050         if (p) {
1051                 if (p == *pstr) {
1052                         pr_err("Invalid time string\n");
1053                         return -EINVAL;
1054                 }
1055 
1056                 *p = 0;
1057                 p++;
1058                 if (*p == 0) {
1059                         pr_err("Invalid time string\n");
1060                         return -EINVAL;
1061                 }
1062         }
1063 
1064         ret = perf_time__parse_for_ranges(*pstr, d->session,
1065                                           &pdiff.ptime_range,
1066                                           &pdiff.range_size,
1067                                           &pdiff.range_num);
1068         if (ret < 0)
1069                 return ret;
1070 
1071         if (!p || *p == 0)
1072                 *pstr = NULL;
1073         else
1074                 *pstr = p;
1075 
1076         return ret;
1077 }
1078 
1079 static int parse_percent_time(struct data__file *d)
1080 {
1081         int ret;
1082 
1083         ret = perf_time__parse_for_ranges(pdiff.time_str, d->session,
1084                                           &pdiff.ptime_range,
1085                                           &pdiff.range_size,
1086                                           &pdiff.range_num);
1087         return ret;
1088 }
1089 
1090 static int parse_time_str(struct data__file *d, char *abstime_ostr,
1091                            char **pabstime_tmp)
1092 {
1093         int ret = 0;
1094 
1095         if (abstime_ostr)
1096                 ret = parse_absolute_time(d, pabstime_tmp);
1097         else if (pdiff.time_str)
1098                 ret = parse_percent_time(d);
1099 
1100         return ret;
1101 }
1102 
1103 static int check_file_brstack(void)
1104 {
1105         struct data__file *d;
1106         bool has_br_stack;
1107         int i;
1108 
1109         data__for_each_file(i, d) {
1110                 d->session = perf_session__new(&d->data, false, &pdiff.tool);
1111                 if (IS_ERR(d->session)) {
1112                         pr_err("Failed to open %s\n", d->data.path);
1113                         return PTR_ERR(d->session);
1114                 }
1115 
1116                 has_br_stack = perf_header__has_feat(&d->session->header,
1117                                                      HEADER_BRANCH_STACK);
1118                 perf_session__delete(d->session);
1119                 if (!has_br_stack)
1120                         return 0;
1121         }
1122 
1123         /* Set only all files having branch stacks */
1124         pdiff.has_br_stack = true;
1125         return 0;
1126 }
1127 
1128 static int __cmd_diff(void)
1129 {
1130         struct data__file *d;
1131         int ret, i;
1132         char *abstime_ostr, *abstime_tmp;
1133 
1134         ret = abstime_str_dup(&abstime_ostr);
1135         if (ret)
1136                 return ret;
1137 
1138         abstime_tmp = abstime_ostr;
1139         ret = -EINVAL;
1140 
1141         data__for_each_file(i, d) {
1142                 d->session = perf_session__new(&d->data, false, &pdiff.tool);
1143                 if (IS_ERR(d->session)) {
1144                         ret = PTR_ERR(d->session);
1145                         pr_err("Failed to open %s\n", d->data.path);
1146                         goto out_delete;
1147                 }
1148 
1149                 if (pdiff.time_str) {
1150                         ret = parse_time_str(d, abstime_ostr, &abstime_tmp);
1151                         if (ret < 0)
1152                                 goto out_delete;
1153                 }
1154 
1155                 if (cpu_list) {
1156                         ret = perf_session__cpu_bitmap(d->session, cpu_list,
1157                                                        cpu_bitmap);
1158                         if (ret < 0)
1159                                 goto out_delete;
1160                 }
1161 
1162                 ret = perf_session__process_events(d->session);
1163                 if (ret) {
1164                         pr_err("Failed to process %s\n", d->data.path);
1165                         goto out_delete;
1166                 }
1167 
1168                 perf_evlist__collapse_resort(d->session->evlist);
1169 
1170                 if (pdiff.ptime_range)
1171                         zfree(&pdiff.ptime_range);
1172         }
1173 
1174         data_process();
1175 
1176  out_delete:
1177         data__for_each_file(i, d) {
1178                 perf_session__delete(d->session);
1179                 data__free(d);
1180         }
1181 
1182         free(data__files);
1183 
1184         if (pdiff.ptime_range)
1185                 zfree(&pdiff.ptime_range);
1186 
1187         if (abstime_ostr)
1188                 free(abstime_ostr);
1189 
1190         return ret;
1191 }
1192 
1193 static const char * const diff_usage[] = {
1194         "perf diff [<options>] [old_file] [new_file]",
1195         NULL,
1196 };
1197 
1198 static const struct option options[] = {
1199         OPT_INCR('v', "verbose", &verbose,
1200                     "be more verbose (show symbol address, etc)"),
1201         OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
1202         OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
1203                     "Show only items with match in baseline"),
1204         OPT_CALLBACK('c', "compute", &compute,
1205                      "delta,delta-abs,ratio,wdiff:w1,w2 (default delta-abs),cycles",
1206                      "Entries differential computation selection",
1207                      setup_compute),
1208         OPT_BOOLEAN('p', "period", &show_period,
1209                     "Show period values."),
1210         OPT_BOOLEAN('F', "formula", &show_formula,
1211                     "Show formula."),
1212         OPT_BOOLEAN(0, "cycles-hist", &cycles_hist,
1213                     "Show cycles histogram and standard deviation "
1214                     "- WARNING: use only with -c cycles."),
1215         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1216                     "dump raw trace in ASCII"),
1217         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
1218         OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
1219                    "file", "kallsyms pathname"),
1220         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
1221                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
1222         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1223                    "only consider symbols in these dsos"),
1224         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1225                    "only consider symbols in these comms"),
1226         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1227                    "only consider these symbols"),
1228         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1229                    "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
1230                    " Please refer the man page for the complete list."),
1231         OPT_STRING_NOEMPTY('t', "field-separator", &symbol_conf.field_sep, "separator",
1232                    "separator for columns, no spaces will be added between "
1233                    "columns '.' is reserved."),
1234         OPT_CALLBACK(0, "symfs", NULL, "directory",
1235                      "Look for files with symbols relative to this directory",
1236                      symbol__config_symfs),
1237         OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
1238         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
1239                      "How to display percentage of filtered entries", parse_filter_percentage),
1240         OPT_STRING(0, "time", &pdiff.time_str, "str",
1241                    "Time span (time percent or absolute timestamp)"),
1242         OPT_STRING(0, "cpu", &cpu_list, "cpu", "list of cpus to profile"),
1243         OPT_STRING(0, "pid", &symbol_conf.pid_list_str, "pid[,pid...]",
1244                    "only consider symbols in these pids"),
1245         OPT_STRING(0, "tid", &symbol_conf.tid_list_str, "tid[,tid...]",
1246                    "only consider symbols in these tids"),
1247         OPT_END()
1248 };
1249 
1250 static double baseline_percent(struct hist_entry *he)
1251 {
1252         u64 total = hists__total_period(he->hists);
1253 
1254         return 100.0 * he->stat.period / total;
1255 }
1256 
1257 static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
1258                                struct perf_hpp *hpp, struct hist_entry *he)
1259 {
1260         struct diff_hpp_fmt *dfmt =
1261                 container_of(fmt, struct diff_hpp_fmt, fmt);
1262         double percent = baseline_percent(he);
1263         char pfmt[20] = " ";
1264 
1265         if (!he->dummy) {
1266                 scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
1267                 return percent_color_snprintf(hpp->buf, hpp->size,
1268                                               pfmt, percent);
1269         } else
1270                 return scnprintf(hpp->buf, hpp->size, "%*s",
1271                                  dfmt->header_width, pfmt);
1272 }
1273 
1274 static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
1275 {
1276         double percent = baseline_percent(he);
1277         const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
1278         int ret = 0;
1279 
1280         if (!he->dummy)
1281                 ret = scnprintf(buf, size, fmt, percent);
1282 
1283         return ret;
1284 }
1285 
1286 static int cycles_printf(struct hist_entry *he, struct hist_entry *pair,
1287                          struct perf_hpp *hpp, int width)
1288 {
1289         struct block_hist *bh = container_of(he, struct block_hist, he);
1290         struct block_hist *bh_pair = container_of(pair, struct block_hist, he);
1291         struct hist_entry *block_he;
1292         struct block_info *bi;
1293         char buf[128];
1294         char *start_line, *end_line;
1295 
1296         block_he = hists__get_entry(&bh_pair->block_hists, bh->block_idx);
1297         if (!block_he) {
1298                 hpp->skip = true;
1299                 return 0;
1300         }
1301 
1302         /*
1303          * Avoid printing the warning "addr2line_init failed for ..."
1304          */
1305         symbol_conf.disable_add2line_warn = true;
1306 
1307         bi = block_he->block_info;
1308 
1309         start_line = map__srcline(he->ms.map, bi->sym->start + bi->start,
1310                                   he->ms.sym);
1311 
1312         end_line = map__srcline(he->ms.map, bi->sym->start + bi->end,
1313                                 he->ms.sym);
1314 
1315         if ((start_line != SRCLINE_UNKNOWN) && (end_line != SRCLINE_UNKNOWN)) {
1316                 scnprintf(buf, sizeof(buf), "[%s -> %s] %4ld",
1317                           start_line, end_line, block_he->diff.cycles);
1318         } else {
1319                 scnprintf(buf, sizeof(buf), "[%7lx -> %7lx] %4ld",
1320                           bi->start, bi->end, block_he->diff.cycles);
1321         }
1322 
1323         free_srcline(start_line);
1324         free_srcline(end_line);
1325 
1326         return scnprintf(hpp->buf, hpp->size, "%*s", width, buf);
1327 }
1328 
1329 static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
1330                                 struct perf_hpp *hpp, struct hist_entry *he,
1331                                 int comparison_method)
1332 {
1333         struct diff_hpp_fmt *dfmt =
1334                 container_of(fmt, struct diff_hpp_fmt, fmt);
1335         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1336         double diff;
1337         s64 wdiff;
1338         char pfmt[20] = " ";
1339 
1340         if (!pair) {
1341                 if (comparison_method == COMPUTE_CYCLES) {
1342                         struct block_hist *bh;
1343 
1344                         bh = container_of(he, struct block_hist, he);
1345                         if (bh->block_idx)
1346                                 hpp->skip = true;
1347                 }
1348 
1349                 goto no_print;
1350         }
1351 
1352         switch (comparison_method) {
1353         case COMPUTE_DELTA:
1354                 if (pair->diff.computed)
1355                         diff = pair->diff.period_ratio_delta;
1356                 else
1357                         diff = compute_delta(he, pair);
1358 
1359                 scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
1360                 return percent_color_snprintf(hpp->buf, hpp->size,
1361                                         pfmt, diff);
1362         case COMPUTE_RATIO:
1363                 if (he->dummy)
1364                         goto dummy_print;
1365                 if (pair->diff.computed)
1366                         diff = pair->diff.period_ratio;
1367                 else
1368                         diff = compute_ratio(he, pair);
1369 
1370                 scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
1371                 return value_color_snprintf(hpp->buf, hpp->size,
1372                                         pfmt, diff);
1373         case COMPUTE_WEIGHTED_DIFF:
1374                 if (he->dummy)
1375                         goto dummy_print;
1376                 if (pair->diff.computed)
1377                         wdiff = pair->diff.wdiff;
1378                 else
1379                         wdiff = compute_wdiff(he, pair);
1380 
1381                 scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
1382                 return color_snprintf(hpp->buf, hpp->size,
1383                                 get_percent_color(wdiff),
1384                                 pfmt, wdiff);
1385         case COMPUTE_CYCLES:
1386                 return cycles_printf(he, pair, hpp, dfmt->header_width);
1387         default:
1388                 BUG_ON(1);
1389         }
1390 dummy_print:
1391         return scnprintf(hpp->buf, hpp->size, "%*s",
1392                         dfmt->header_width, "N/A");
1393 no_print:
1394         return scnprintf(hpp->buf, hpp->size, "%*s",
1395                         dfmt->header_width, pfmt);
1396 }
1397 
1398 static int hpp__color_delta(struct perf_hpp_fmt *fmt,
1399                         struct perf_hpp *hpp, struct hist_entry *he)
1400 {
1401         return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
1402 }
1403 
1404 static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
1405                         struct perf_hpp *hpp, struct hist_entry *he)
1406 {
1407         return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
1408 }
1409 
1410 static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
1411                         struct perf_hpp *hpp, struct hist_entry *he)
1412 {
1413         return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
1414 }
1415 
1416 static int hpp__color_cycles(struct perf_hpp_fmt *fmt,
1417                              struct perf_hpp *hpp, struct hist_entry *he)
1418 {
1419         return __hpp__color_compare(fmt, hpp, he, COMPUTE_CYCLES);
1420 }
1421 
1422 static int all_zero(unsigned long *vals, int len)
1423 {
1424         int i;
1425 
1426         for (i = 0; i < len; i++)
1427                 if (vals[i] != 0)
1428                         return 0;
1429         return 1;
1430 }
1431 
1432 static int print_cycles_spark(char *bf, int size, unsigned long *svals, u64 n)
1433 {
1434         int printed;
1435 
1436         if (n <= 1)
1437                 return 0;
1438 
1439         if (n > NUM_SPARKS)
1440                 n = NUM_SPARKS;
1441         if (all_zero(svals, n))
1442                 return 0;
1443 
1444         printed = print_spark(bf, size, svals, n);
1445         printed += scnprintf(bf + printed, size - printed, " ");
1446         return printed;
1447 }
1448 
1449 static int hpp__color_cycles_hist(struct perf_hpp_fmt *fmt,
1450                             struct perf_hpp *hpp, struct hist_entry *he)
1451 {
1452         struct diff_hpp_fmt *dfmt =
1453                 container_of(fmt, struct diff_hpp_fmt, fmt);
1454         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1455         struct block_hist *bh = container_of(he, struct block_hist, he);
1456         struct block_hist *bh_pair;
1457         struct hist_entry *block_he;
1458         char spark[32], buf[128];
1459         double r;
1460         int ret, pad;
1461 
1462         if (!pair) {
1463                 if (bh->block_idx)
1464                         hpp->skip = true;
1465 
1466                 goto no_print;
1467         }
1468 
1469         bh_pair = container_of(pair, struct block_hist, he);
1470 
1471         block_he = hists__get_entry(&bh_pair->block_hists, bh->block_idx);
1472         if (!block_he) {
1473                 hpp->skip = true;
1474                 goto no_print;
1475         }
1476 
1477         ret = print_cycles_spark(spark, sizeof(spark), block_he->diff.svals,
1478                                  block_he->diff.stats.n);
1479 
1480         r = rel_stddev_stats(stddev_stats(&block_he->diff.stats),
1481                              avg_stats(&block_he->diff.stats));
1482 
1483         if (ret) {
1484                 /*
1485                  * Padding spaces if number of sparks less than NUM_SPARKS
1486                  * otherwise the output is not aligned.
1487                  */
1488                 pad = NUM_SPARKS - ((ret - 1) / 3);
1489                 scnprintf(buf, sizeof(buf), "%s%5.1f%% %s", "\u00B1", r, spark);
1490                 ret = scnprintf(hpp->buf, hpp->size, "%*s",
1491                                 dfmt->header_width, buf);
1492 
1493                 if (pad) {
1494                         ret += scnprintf(hpp->buf + ret, hpp->size - ret,
1495                                          "%-*s", pad, " ");
1496                 }
1497 
1498                 return ret;
1499         }
1500 
1501 no_print:
1502         return scnprintf(hpp->buf, hpp->size, "%*s",
1503                         dfmt->header_width, " ");
1504 }
1505 
1506 static void
1507 hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
1508 {
1509         switch (idx) {
1510         case PERF_HPP_DIFF__PERIOD_BASELINE:
1511                 scnprintf(buf, size, "%" PRIu64, he->stat.period);
1512                 break;
1513 
1514         default:
1515                 break;
1516         }
1517 }
1518 
1519 static void
1520 hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
1521                 int idx, char *buf, size_t size)
1522 {
1523         double diff;
1524         double ratio;
1525         s64 wdiff;
1526 
1527         switch (idx) {
1528         case PERF_HPP_DIFF__DELTA:
1529         case PERF_HPP_DIFF__DELTA_ABS:
1530                 if (pair->diff.computed)
1531                         diff = pair->diff.period_ratio_delta;
1532                 else
1533                         diff = compute_delta(he, pair);
1534 
1535                 scnprintf(buf, size, "%+4.2F%%", diff);
1536                 break;
1537 
1538         case PERF_HPP_DIFF__RATIO:
1539                 /* No point for ratio number if we are dummy.. */
1540                 if (he->dummy) {
1541                         scnprintf(buf, size, "N/A");
1542                         break;
1543                 }
1544 
1545                 if (pair->diff.computed)
1546                         ratio = pair->diff.period_ratio;
1547                 else
1548                         ratio = compute_ratio(he, pair);
1549 
1550                 if (ratio > 0.0)
1551                         scnprintf(buf, size, "%14.6F", ratio);
1552                 break;
1553 
1554         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1555                 /* No point for wdiff number if we are dummy.. */
1556                 if (he->dummy) {
1557                         scnprintf(buf, size, "N/A");
1558                         break;
1559                 }
1560 
1561                 if (pair->diff.computed)
1562                         wdiff = pair->diff.wdiff;
1563                 else
1564                         wdiff = compute_wdiff(he, pair);
1565 
1566                 if (wdiff != 0)
1567                         scnprintf(buf, size, "%14ld", wdiff);
1568                 break;
1569 
1570         case PERF_HPP_DIFF__FORMULA:
1571                 formula_fprintf(he, pair, buf, size);
1572                 break;
1573 
1574         case PERF_HPP_DIFF__PERIOD:
1575                 scnprintf(buf, size, "%" PRIu64, pair->stat.period);
1576                 break;
1577 
1578         default:
1579                 BUG_ON(1);
1580         };
1581 }
1582 
1583 static void
1584 __hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
1585                     char *buf, size_t size)
1586 {
1587         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1588         int idx = dfmt->idx;
1589 
1590         /* baseline is special */
1591         if (idx == PERF_HPP_DIFF__BASELINE)
1592                 hpp__entry_baseline(he, buf, size);
1593         else {
1594                 if (pair)
1595                         hpp__entry_pair(he, pair, idx, buf, size);
1596                 else
1597                         hpp__entry_unpair(he, idx, buf, size);
1598         }
1599 }
1600 
1601 static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
1602                              struct hist_entry *he)
1603 {
1604         struct diff_hpp_fmt *dfmt =
1605                 container_of(_fmt, struct diff_hpp_fmt, fmt);
1606         char buf[MAX_COL_WIDTH] = " ";
1607 
1608         __hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
1609 
1610         if (symbol_conf.field_sep)
1611                 return scnprintf(hpp->buf, hpp->size, "%s", buf);
1612         else
1613                 return scnprintf(hpp->buf, hpp->size, "%*s",
1614                                  dfmt->header_width, buf);
1615 }
1616 
1617 static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
1618                        struct hists *hists __maybe_unused,
1619                        int line __maybe_unused,
1620                        int *span __maybe_unused)
1621 {
1622         struct diff_hpp_fmt *dfmt =
1623                 container_of(fmt, struct diff_hpp_fmt, fmt);
1624 
1625         BUG_ON(!dfmt->header);
1626         return scnprintf(hpp->buf, hpp->size, dfmt->header);
1627 }
1628 
1629 static int hpp__width(struct perf_hpp_fmt *fmt,
1630                       struct perf_hpp *hpp __maybe_unused,
1631                       struct hists *hists __maybe_unused)
1632 {
1633         struct diff_hpp_fmt *dfmt =
1634                 container_of(fmt, struct diff_hpp_fmt, fmt);
1635 
1636         BUG_ON(dfmt->header_width <= 0);
1637         return dfmt->header_width;
1638 }
1639 
1640 static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
1641 {
1642 #define MAX_HEADER_NAME 100
1643         char buf_indent[MAX_HEADER_NAME];
1644         char buf[MAX_HEADER_NAME];
1645         const char *header = NULL;
1646         int width = 0;
1647 
1648         BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
1649         header = columns[dfmt->idx].name;
1650         width  = columns[dfmt->idx].width;
1651 
1652         /* Only our defined HPP fmts should appear here. */
1653         BUG_ON(!header);
1654 
1655         if (data__files_cnt > 2)
1656                 scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1657 
1658 #define NAME (data__files_cnt > 2 ? buf : header)
1659         dfmt->header_width = width;
1660         width = (int) strlen(NAME);
1661         if (dfmt->header_width < width)
1662                 dfmt->header_width = width;
1663 
1664         scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1665                   dfmt->header_width, NAME);
1666 
1667         dfmt->header = strdup(buf_indent);
1668 #undef MAX_HEADER_NAME
1669 #undef NAME
1670 }
1671 
1672 static void data__hpp_register(struct data__file *d, int idx)
1673 {
1674         struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1675         struct perf_hpp_fmt *fmt = &dfmt->fmt;
1676 
1677         dfmt->idx = idx;
1678 
1679         fmt->header = hpp__header;
1680         fmt->width  = hpp__width;
1681         fmt->entry  = hpp__entry_global;
1682         fmt->cmp    = hist_entry__cmp_nop;
1683         fmt->collapse = hist_entry__cmp_nop;
1684 
1685         /* TODO more colors */
1686         switch (idx) {
1687         case PERF_HPP_DIFF__BASELINE:
1688                 fmt->color = hpp__color_baseline;
1689                 fmt->sort  = hist_entry__cmp_baseline;
1690                 break;
1691         case PERF_HPP_DIFF__DELTA:
1692                 fmt->color = hpp__color_delta;
1693                 fmt->sort  = hist_entry__cmp_delta;
1694                 break;
1695         case PERF_HPP_DIFF__RATIO:
1696                 fmt->color = hpp__color_ratio;
1697                 fmt->sort  = hist_entry__cmp_ratio;
1698                 break;
1699         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1700                 fmt->color = hpp__color_wdiff;
1701                 fmt->sort  = hist_entry__cmp_wdiff;
1702                 break;
1703         case PERF_HPP_DIFF__DELTA_ABS:
1704                 fmt->color = hpp__color_delta;
1705                 fmt->sort  = hist_entry__cmp_delta_abs;
1706                 break;
1707         case PERF_HPP_DIFF__CYCLES:
1708                 fmt->color = hpp__color_cycles;
1709                 fmt->sort  = hist_entry__cmp_nop;
1710                 break;
1711         case PERF_HPP_DIFF__CYCLES_HIST:
1712                 fmt->color = hpp__color_cycles_hist;
1713                 fmt->sort  = hist_entry__cmp_nop;
1714                 break;
1715         default:
1716                 fmt->sort  = hist_entry__cmp_nop;
1717                 break;
1718         }
1719 
1720         init_header(d, dfmt);
1721         perf_hpp__column_register(fmt);
1722         perf_hpp__register_sort_field(fmt);
1723 }
1724 
1725 static int ui_init(void)
1726 {
1727         struct data__file *d;
1728         struct perf_hpp_fmt *fmt;
1729         int i;
1730 
1731         data__for_each_file(i, d) {
1732 
1733                 /*
1734                  * Baseline or compute realted columns:
1735                  *
1736                  *   PERF_HPP_DIFF__BASELINE
1737                  *   PERF_HPP_DIFF__DELTA
1738                  *   PERF_HPP_DIFF__RATIO
1739                  *   PERF_HPP_DIFF__WEIGHTED_DIFF
1740                  *   PERF_HPP_DIFF__CYCLES
1741                  */
1742                 data__hpp_register(d, i ? compute_2_hpp[compute] :
1743                                           PERF_HPP_DIFF__BASELINE);
1744 
1745                 if (cycles_hist && i)
1746                         data__hpp_register(d, PERF_HPP_DIFF__CYCLES_HIST);
1747 
1748                 /*
1749                  * And the rest:
1750                  *
1751                  * PERF_HPP_DIFF__FORMULA
1752                  * PERF_HPP_DIFF__PERIOD
1753                  * PERF_HPP_DIFF__PERIOD_BASELINE
1754                  */
1755                 if (show_formula && i)
1756                         data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1757 
1758                 if (show_period)
1759                         data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1760                                                   PERF_HPP_DIFF__PERIOD_BASELINE);
1761         }
1762 
1763         if (!sort_compute)
1764                 return 0;
1765 
1766         /*
1767          * Prepend an fmt to sort on columns at 'sort_compute' first.
1768          * This fmt is added only to the sort list but not to the
1769          * output fields list.
1770          *
1771          * Note that this column (data) can be compared twice - one
1772          * for this 'sort_compute' fmt and another for the normal
1773          * diff_hpp_fmt.  But it shouldn't a problem as most entries
1774          * will be sorted out by first try or baseline and comparing
1775          * is not a costly operation.
1776          */
1777         fmt = zalloc(sizeof(*fmt));
1778         if (fmt == NULL) {
1779                 pr_err("Memory allocation failed\n");
1780                 return -1;
1781         }
1782 
1783         fmt->cmp      = hist_entry__cmp_nop;
1784         fmt->collapse = hist_entry__cmp_nop;
1785 
1786         switch (compute) {
1787         case COMPUTE_DELTA:
1788                 fmt->sort = hist_entry__cmp_delta_idx;
1789                 break;
1790         case COMPUTE_RATIO:
1791                 fmt->sort = hist_entry__cmp_ratio_idx;
1792                 break;
1793         case COMPUTE_WEIGHTED_DIFF:
1794                 fmt->sort = hist_entry__cmp_wdiff_idx;
1795                 break;
1796         case COMPUTE_DELTA_ABS:
1797                 fmt->sort = hist_entry__cmp_delta_abs_idx;
1798                 break;
1799         case COMPUTE_CYCLES:
1800                 /*
1801                  * Should set since 'fmt->sort' is called without
1802                  * checking valid during sorting
1803                  */
1804                 fmt->sort = hist_entry__cmp_nop;
1805                 break;
1806         default:
1807                 BUG_ON(1);
1808         }
1809 
1810         perf_hpp__prepend_sort_field(fmt);
1811         return 0;
1812 }
1813 
1814 static int data_init(int argc, const char **argv)
1815 {
1816         struct data__file *d;
1817         static const char *defaults[] = {
1818                 "perf.data.old",
1819                 "perf.data",
1820         };
1821         bool use_default = true;
1822         int i;
1823 
1824         data__files_cnt = 2;
1825 
1826         if (argc) {
1827                 if (argc == 1)
1828                         defaults[1] = argv[0];
1829                 else {
1830                         data__files_cnt = argc;
1831                         use_default = false;
1832                 }
1833         } else if (perf_guest) {
1834                 defaults[0] = "perf.data.host";
1835                 defaults[1] = "perf.data.guest";
1836         }
1837 
1838         if (sort_compute >= (unsigned int) data__files_cnt) {
1839                 pr_err("Order option out of limit.\n");
1840                 return -EINVAL;
1841         }
1842 
1843         data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1844         if (!data__files)
1845                 return -ENOMEM;
1846 
1847         data__for_each_file(i, d) {
1848                 struct perf_data *data = &d->data;
1849 
1850                 data->path  = use_default ? defaults[i] : argv[i];
1851                 data->mode  = PERF_DATA_MODE_READ,
1852                 data->force = force,
1853 
1854                 d->idx  = i;
1855         }
1856 
1857         return 0;
1858 }
1859 
1860 static int diff__config(const char *var, const char *value,
1861                         void *cb __maybe_unused)
1862 {
1863         if (!strcmp(var, "diff.order")) {
1864                 int ret;
1865                 if (perf_config_int(&ret, var, value) < 0)
1866                         return -1;
1867                 sort_compute = ret;
1868                 return 0;
1869         }
1870         if (!strcmp(var, "diff.compute")) {
1871                 if (!strcmp(value, "delta")) {
1872                         compute = COMPUTE_DELTA;
1873                 } else if (!strcmp(value, "delta-abs")) {
1874                         compute = COMPUTE_DELTA_ABS;
1875                 } else if (!strcmp(value, "ratio")) {
1876                         compute = COMPUTE_RATIO;
1877                 } else if (!strcmp(value, "wdiff")) {
1878                         compute = COMPUTE_WEIGHTED_DIFF;
1879                 } else {
1880                         pr_err("Invalid compute method: %s\n", value);
1881                         return -1;
1882                 }
1883         }
1884 
1885         return 0;
1886 }
1887 
1888 int cmd_diff(int argc, const char **argv)
1889 {
1890         int ret = hists__init();
1891 
1892         if (ret < 0)
1893                 return ret;
1894 
1895         perf_config(diff__config, NULL);
1896 
1897         argc = parse_options(argc, argv, options, diff_usage, 0);
1898 
1899         if (quiet)
1900                 perf_quiet_option();
1901 
1902         if (cycles_hist && (compute != COMPUTE_CYCLES))
1903                 usage_with_options(diff_usage, options);
1904 
1905         symbol__annotation_init();
1906 
1907         if (symbol__init(NULL) < 0)
1908                 return -1;
1909 
1910         if (data_init(argc, argv) < 0)
1911                 return -1;
1912 
1913         if (check_file_brstack() < 0)
1914                 return -1;
1915 
1916         if (compute == COMPUTE_CYCLES && !pdiff.has_br_stack)
1917                 return -1;
1918 
1919         if (ui_init() < 0)
1920                 return -1;
1921 
1922         sort__mode = SORT_MODE__DIFF;
1923 
1924         if (setup_sorting(NULL) < 0)
1925                 usage_with_options(diff_usage, options);
1926 
1927         setup_pager();
1928 
1929         sort__setup_elide(NULL);
1930 
1931         return __cmd_diff();
1932 }
1933 

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